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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: ( x^3 – 3x^2 + 5x – 6 ) / ( x – 2 )

Toán Lớp 8: ( x^3 – 3x^2 + 5x – 6 ) / ( x – 2 )

Comments ( 1 )

  1. – Cách 1:
    (x^3-3x^2+5x-6):(x-2)=x^2-x+3
    (Theo cách đặt tính, mk sẽ trình bày trong hình)
    – Cách 2: (theo cách tính thông thường)
    x^3-3x^2+5x-6
    =x^3-2x^2-x^2+2x+3x-6
    =x^2(x-2)-x(x-2)+3(x-2)
    =(x-2)(x^2-x+3)
    =>(x^3-3x^2+5x-6):(x-2)
    =\cancel{(x-2)}(x^2-x+3)
    =x^2-x+3

    toan-lop-8-3-3-2-5-6-2

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222-9+11+12:2*14+14 = ? ( )

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